Anus internal muscle sphincter
The internal anal sphincter, IAS, (or sphincter ani internus) is a muscular ring that surrounds about – cm of the anal canal; its inferior border is in contact with, but quite separate from, the external anal sphincter.
It is about 5 mm thick, and is formed by an aggregation of the involuntary circular fibers of the rectum.
The external anal sphincter (or sphincter ani externus) is a flat plane of muscular fibers, cm opposite the anus, when defecation occurs the sphincter muscle retracts. Its fibers surround the canal, closely applied to the internal anal sphincter, and in front blend with the other muscles at the central point of the perineum.
There was a problem providing the content you requested
Zanna Age: 21. Seeking lasting relationships with quality gentlemen who are generous, sophisticated and courteous, i cater only to the upscale elite gentleman who appreciated the finer things and appreciates inner and outer beauty, elegance, intelligence and sophistication.Welcome,Gentlemen!My name is Iness:-)and I amhere for every Man who loves spend a time in company of skinny girls like me!I am natural blonde,cm and kg,my body is hot and tiny with silky skin!I am russian girl who born in Moscow and who have a good education and well manners!I love sex and I know how to make a man relaxed!So,don't hesitate to contact me and Your time in my city will be like champagne bubbles,bright and unforgettable!
Description:Anal Stenosis Anal Stricture What is anal stenosis? When a tubular organ or blood vessel becomes excessively narrow such that it can no longer perform as nature intended, it is a condition referred to by physicians as stenosis. Anal stenosis, also known as an anal stricture, is the narrowing of the anal canal, located just before the anal sphincter. What is the anal sphincter?